fix `NO_COLOR` support

CHANGELOG.md

@@ -1,3 +1,7 @@
+## v1.2.1-dev
+
+- Fix `NO_COLOR` support.
+
 ## v1.2.0
 
 phetch is all about fun colors, but your options have always been

src/theme.rs

@@ -116,6 +116,10 @@ item.unsupported {item_unsupported}",
 
 /// Convert a string like "blue underline" or "red" into a color code.
 pub fn to_color<S: AsRef<str>>(line: S) -> String {
+    if *crate::NO_COLOR {
+        return "".into();
+    }
+
     let parts = line.as_ref().split(' ').collect::<Vec<_>>();
 
     if parts.is_empty() {